A nonhazardous member with at least 25 but less than 27 years of service credit may retire at any time, prior to age 65, with a reduction in benefits. A nonhazardous member, age 55, with at least five years of service credit may retire with a reduction in benefits. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.